WTF? I can't believe you didn't blow up your car up in the process and you're lucky you didn't get injured.
Unfortunately, your initial remedies probably did more harm than good in the long run. Since gasoline is NOT miscible with water, the LAST thing you should have done was mix it with water (vinegar) to clean it up as that would just prolong the time it takes for the gasoline to evaporate. Gasoline, by necessity, is very volatile, which is why you smell and continue to detect it so strongly. By combining it with water, you essentially slowed down the evaporation process because the water traps it in a time release fashion. The other thing about using vinegar is it's nothing but dilute acetic acid which is corrosive to metal. This is why they had you use baking soda after wards to neutralize the acid. The problem now is, you may have residual salts left behind from the baking soda (which may also act to trap vapors by adsorption).
At this point, I'd remove everything from the trunk and thoroughly rinse with clean water and let dry with the trunk open. Leave the trunk liner out forever until it is odor free and leave the trunk open. Rent one of those heaters used to dry out homes after being flooded and thoroughly dry out the trunk area. The combination of heat and high volume of air flow may do the trick. The key is to place the heater unit in such a way that it won't overheat and damage anything in your car or cause a fire by being placed to closely (supervise).
The goal is to remove ALL vapors (both organic and aqueous) by volatilizing and evaporating them. Once they are gone, they're gone and all should be fine.
In addition to the above, to capture any residual organic vapors (hydrocarbons) and moisture, I'd use a combination of activated charcoal (for organic odors) and silica (to adsorb moisture) and change them out as needed. I work as an Analytical Chemist for a pharmaceutical company and have access to pallets full of both materials. In your case, both of the above materials can be found in a local pool supply company since they are commonly used in filtration.
Here are some links to learn about the materials I'm talking about
Activated Carbon Technologies
Celatom Filter Aid Diatomite for Swimming Pools 8826 by Baleco International Inc. for $19.99 - America's Farm and Home Store
Avoid breathing dust from either material and place equal parts in a pillow case, zip tie and mix them together, and place in your trunk until the mixture is saturated. After a day or two, change it out and repeat the process over again. The combination of doing all of the above steps should do the trick. If you do nothing else, leave the trunk open as much as possible in order to allow lingering odors and moisture to escape. Don't forget to remove the trunk light so the battery's not drained. I don't think I need to tell you to NEVER put flammable material in the trunk again! Good luck.
This product is new to me.
You mentioned you are a Analytical Chemist so seem very knowledgeable. So far, the trunk still stinks like gasoline. It happened almost a week ago.
After I soaked up all the gasoline from the trunk from initial spill
I immediately tried soap and water (then let it dry)
2nd day I used white vinegar with water (then let it dry)
3rd day baking soda with water (then let it dry)
4th day I currently have a bag of Gonzo Odor Eliminator which is supposed to take the smell of anything out of anything but isn't doing anything (YET). Supposably this stuff uses the same incredeints.
My wife already bought this stuff at the Lowes and the guy said this takes out gasoline odors and does the same thing. I figured I use it since she already bought it before I read your post.At this point, not sure if I'm making things worse or not?
I haven't put back any of the lining or anything yet, and have removed the trunk light so my battery doesn't die.
So do I mix this "Celatom Filter Aid Diatomite for Swimming Pools with water" and wipe the trunk clean with this stuff? Add what to it? Wipe with a rag the affected area? Or should I wait longer for the gas to dissipate even though it does not seem like it is at all.
At this point the gasoline smell is no longer a punch in the face, but a slap in the face now.
I'm so upset with myself. I knew it was a bad idea getting gasoline in a can and putting it in my trunk. Initially I had the gas can on the floor in the front passenger side with the seat pushed forward on it so it wouldn't move in a crate with the windows down and the fumes were still making me gag. I drove home so slowly with it in the trunk and knew it was going to spill and did it anyway. Happened just a block away from home.
I am Miserable right now. Am I an absolute IDIOT? Yes I am.